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Yellow wrot copper adapter, cylindrical with threaded female end

Nibco, Inc.

Nibco, Inc. 903 1-1/2" C x FNPT Copper Adapter

SKU CH-95MN-5TFR9

Connects 1-1/2 inch copper tube to female NPT threads, rated to 5 psi from -20 to 400 degrees F

  • Wrot copper construction meets ASTM B75 alloy C12200 standard
  • C x FNPT connection joins 1-1/2 in tube to 1-1/2 in pipe thread
  • Rated for 5 psi working pressure in plumbing systems
  • Operates from -20 to 400 degrees F across temperature range
  • Complies with ASME B16.29 fitting dimensions

1-1/2" Copper C x FNPT Adapter

This Nibco 903 adapter joins 1-1/2 inch nominal copper tubing to a 1-1/2 inch FNPT threaded connection. It is made from wrought copper alloy C12200 and conforms to ASTM B75 and ASME B16.29 standards. The fitting carries a maximum pressure rating of 5 psi and operates from -20 to 400 degrees F.

Installers needing a sweat-to-thread transition

The adapter suits plumbers converting copper tube to female pipe threads in heating or water lines. It is not intended for high-pressure systems exceeding the 5 psi limit. Buyers requiring a different pipe diameter or a male-threaded outlet should select another fitting.

5 psi maximum pressure rating

The 5 psi ceiling is the critical figure that determines whether this adapter matches the system design. Verify the operating pressure of the circuit before installing. The yellow finish helps identify the component on site.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 73% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameNibco

Questions about this item

What copper pipe size do I need to solder into the 1-1/2" C end of this Nibco 903 adapter?

The solder cup is sized for 1-1/2 inch nominal copper tube, which has a 1-5/8 inch outside diameter, so you must already have that exact tube size.

Will the 1-1/2" FNPT threads on this adapter mate with my existing 1-1/2" male iron pipe fittings?

Yes, the FNPT end follows ASME B16.29 and is cut to 1-1/2 inch pipe size, so standard 1-1/2 inch MPT nipples or valves will thread directly into it.

After soldering and threading, how can I confirm the joint holds pressure within the 5 psi rating?

Pressurise the system to the working pressure, then brush soapy water on the solder cup and the threaded joint; no bubbles means the adapter is sealed correctly.

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